SELECT 
  v.product_id, 
  v.feature_id, 
  v.value, 
  v.value_int, 
  v.variant_id, 
  f.feature_type, 
  fd.description, 
  fd.prefix, 
  fd.suffix, 
  vd.variant, 
  f.parent_id, 
  f.position, 
  gf.position as gposition 
FROM 
  cscart_product_features as f 
  LEFT JOIN cscart_product_features_values as v ON v.feature_id = f.feature_id 
  LEFT JOIN cscart_product_features_descriptions as fd ON fd.feature_id = v.feature_id 
  AND fd.lang_code = 'en' 
  LEFT JOIN cscart_product_feature_variants fv ON fv.variant_id = v.variant_id 
  LEFT JOIN cscart_product_feature_variant_descriptions as vd ON vd.variant_id = fv.variant_id 
  AND vd.lang_code = 'en' 
  LEFT JOIN cscart_product_features as gf ON gf.feature_id = f.parent_id 
  AND gf.feature_type = 'G' 
WHERE 
  f.status IN ('A') 
  AND v.product_id in (
    276426, 
    276427, 
    276428, 
    276429, 
    276430, 
    276431, 
    276432, 
    276433, 
    276434, 
    276435, 
    276436, 
    276437, 
    276438, 
    276439, 
    276440, 
    276441, 
    276442, 
    276443, 
    276444, 
    276445, 
    276446, 
    276447, 
    276448, 
    276449, 
    276450, 
    276451, 
    276452, 
    276453, 
    276454, 
    276455, 
    276456, 
    276457, 
    276458, 
    276459, 
    276460, 
    276461, 
    276462, 
    276463, 
    276464, 
    276465, 
    276466, 
    276467, 
    276468, 
    276469, 
    276470, 
    276471, 
    276472, 
    276473, 
    276474, 
    276475, 
    276476, 
    276477, 
    276478, 
    276497, 
    276498, 
    276499, 
    276500, 
    276501, 
    276502, 
    276503, 
    276504, 
    276505, 
    276506, 
    276507, 
    276508, 
    276509, 
    276510, 
    276511, 
    276512, 
    276513, 
    276514, 
    276515, 
    276516, 
    276517, 
    276518, 
    276519, 
    276520, 
    276521, 
    276522, 
    276523, 
    276524, 
    276525, 
    276526, 
    276527, 
    276528, 
    276529, 
    276530, 
    276531, 
    276532, 
    276533, 
    276534, 
    276535, 
    276536, 
    276537, 
    276538, 
    276539, 
    276540, 
    276541, 
    276542, 
    276543, 
    276544, 
    276545, 
    276546, 
    276547, 
    276548, 
    276549, 
    276550, 
    276551, 
    276552, 
    276553, 
    276572, 
    276573, 
    276574, 
    276575, 
    276588, 
    276589, 
    276590, 
    276591, 
    276592, 
    276593, 
    276594, 
    276595, 
    276596, 
    276597, 
    276598, 
    276599, 
    276600, 
    276601, 
    276602, 
    276603, 
    276604, 
    276605, 
    276606, 
    276607, 
    276608, 
    276609, 
    276610, 
    276611, 
    276612, 
    276613, 
    276614, 
    276615, 
    276616, 
    276617, 
    276618, 
    276619, 
    276620, 
    276621, 
    276622, 
    276623, 
    276624, 
    276625, 
    276626
  ) 
  AND f.display_on_catalog = 'Y' 
  AND (
    f.categories_path = '' 
    OR FIND_IN_SET(5188, f.categories_path) 
    OR FIND_IN_SET(4936, f.categories_path)
  ) 
  AND IF(
    f.parent_id, 
    (
      SELECT 
        status 
      FROM 
        cscart_product_features as df 
      WHERE 
        df.feature_id = f.parent_id
    ), 
    'A'
  ) IN ('A') 
  AND (
    v.variant_id != 0 
    OR (
      f.feature_type != 'C' 
      AND v.value != ''
    ) 
    OR (f.feature_type = 'C') 
    OR v.value_int != ''
  ) 
  AND v.lang_code = 'en' 
ORDER BY 
  fd.description, 
  fv.position

Query time 0.00170

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "158.68"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "v",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "fl",
              "variant_id",
              "lang_code",
              "product_id",
              "fpl",
              "idx_product_feature_variant_id"
            ],
            "key": "product_id",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 153,
            "rows_produced_per_join": 100,
            "filtered": "65.53",
            "index_condition": "(`s2cart`.`v`.`product_id` in (276426,276427,276428,276429,276430,276431,276432,276433,276434,276435,276436,276437,276438,276439,276440,276441,276442,276443,276444,276445,276446,276447,276448,276449,276450,276451,276452,276453,276454,276455,276456,276457,276458,276459,276460,276461,276462,276463,276464,276465,276466,276467,276468,276469,276470,276471,276472,276473,276474,276475,276476,276477,276478,276497,276498,276499,276500,276501,276502,276503,276504,276505,276506,276507,276508,276509,276510,276511,276512,276513,276514,276515,276516,276517,276518,276519,276520,276521,276522,276523,276524,276525,276526,276527,276528,276529,276530,276531,276532,276533,276534,276535,276536,276537,276538,276539,276540,276541,276542,276543,276544,276545,276546,276547,276548,276549,276550,276551,276552,276553,276572,276573,276574,276575,276588,276589,276590,276591,276592,276593,276594,276595,276596,276597,276598,276599,276600,276601,276602,276603,276604,276605,276606,276607,276608,276609,276610,276611,276612,276613,276614,276615,276616,276617,276618,276619,276620,276621,276622,276623,276624,276625,276626))",
            "cost_info": {
              "read_cost": "97.08",
              "eval_cost": "10.03",
              "prefix_cost": "107.11",
              "data_read_per_join": "77K"
            },
            "used_columns": [
              "feature_id",
              "product_id",
              "variant_id",
              "value",
              "value_int",
              "lang_code"
            ],
            "attached_condition": "((`s2cart`.`v`.`lang_code` = 'en') and (`s2cart`.`v`.`feature_id` is not null))"
          }
        },
        {
          "table": {
            "table_name": "f",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "status"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id"
            ],
            "key_length": "3",
            "ref": [
              "s2cart.v.feature_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "9.98",
            "cost_info": {
              "read_cost": "25.07",
              "eval_cost": "1.00",
              "prefix_cost": "142.20",
              "data_read_per_join": "4K"
            },
            "used_columns": [
              "feature_id",
              "feature_type",
              "categories_path",
              "parent_id",
              "display_on_catalog",
              "status",
              "position"
            ],
            "attached_condition": "((`s2cart`.`f`.`status` = 'A') and (`s2cart`.`f`.`display_on_catalog` = 'Y') and ((`s2cart`.`f`.`categories_path` = '') or (0 <> find_in_set(5188,`s2cart`.`f`.`categories_path`)) or (0 <> find_in_set(4936,`s2cart`.`f`.`categories_path`))) and (if(`s2cart`.`f`.`parent_id`,(/* select#2 */ select `s2cart`.`df`.`status` from `s2cart`.`cscart_product_features` `df` where (`s2cart`.`df`.`feature_id` = `s2cart`.`f`.`parent_id`)),'A') = 'A') and ((`s2cart`.`v`.`variant_id` <> 0) or ((`s2cart`.`f`.`feature_type` <> 'C') and (`s2cart`.`v`.`value` <> '')) or (`s2cart`.`f`.`feature_type` = 'C') or (`s2cart`.`v`.`value_int` <> 0)))",
            "attached_subqueries": [
              {
                "dependent": true,
                "cacheable": false,
                "query_block": {
                  "select_id": 2,
                  "cost_info": {
                    "query_cost": "0.35"
                  },
                  "table": {
                    "table_name": "df",
                    "access_type": "eq_ref",
                    "possible_keys": [
                      "PRIMARY"
                    ],
                    "key": "PRIMARY",
                    "used_key_parts": [
                      "feature_id"
                    ],
                    "key_length": "3",
                    "ref": [
                      "s2cart.f.parent_id"
                    ],
                    "rows_examined_per_scan": 1,
                    "rows_produced_per_join": 1,
                    "filtered": "100.00",
                    "cost_info": {
                      "read_cost": "0.25",
                      "eval_cost": "0.10",
                      "prefix_cost": "0.35",
                      "data_read_per_join": "440"
                    },
                    "used_columns": [
                      "feature_id",
                      "status"
                    ]
                  }
                }
              }
            ]
          }
        },
        {
          "table": {
            "table_name": "fd",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "s2cart.v.feature_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "2.50",
              "eval_cost": "1.00",
              "prefix_cost": "145.70",
              "data_read_per_join": "22K"
            },
            "used_columns": [
              "feature_id",
              "description",
              "prefix",
              "suffix",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "fv",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id"
            ],
            "key_length": "3",
            "ref": [
              "s2cart.v.variant_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "2.50",
              "eval_cost": "1.00",
              "prefix_cost": "149.20",
              "data_read_per_join": "11K"
            },
            "used_columns": [
              "variant_id",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "vd",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "s2cart.fv.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "4.98",
              "eval_cost": "1.00",
              "prefix_cost": "155.18",
              "data_read_per_join": "60K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "gf",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id"
            ],
            "key_length": "3",
            "ref": [
              "s2cart.f.parent_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 10,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "2.50",
              "eval_cost": "1.00",
              "prefix_cost": "158.68",
              "data_read_per_join": "4K"
            },
            "used_columns": [
              "feature_id",
              "feature_type",
              "position"
            ],
            "attached_condition": "<if>(is_not_null_compl(gf), (`s2cart`.`gf`.`feature_type` = 'G'), true)"
          }
        }
      ]
    }
  }
}