SELECT 
  filter_id, 
  feature_id 
FROM 
  cscart_product_filters 
WHERE 
  status = 'A'

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.12"
    },
    "table": {
      "table_name": "cscart_product_filters",
      "access_type": "ALL",
      "rows_examined_per_scan": 6,
      "rows_produced_per_join": 1,
      "filtered": "16.67",
      "cost_info": {
        "read_cost": "1.02",
        "eval_cost": "0.10",
        "prefix_cost": "1.12",
        "data_read_per_join": "72"
      },
      "used_columns": [
        "filter_id",
        "feature_id",
        "status"
      ],
      "attached_condition": "(`s2cart`.`cscart_product_filters`.`status` = 'A')"
    }
  }
}