SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    276654, 276655, 276656, 276657, 276658, 
    276659, 276660, 276661, 276662, 276663, 
    276664, 276665, 276666, 276667, 276668, 
    276669, 276670, 276671, 276672, 276673
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "44.01"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 20,
      "rows_produced_per_join": 20,
      "filtered": "100.00",
      "index_condition": "((`s2cart`.`cscart_product_descriptions`.`product_id` in (276654,276655,276656,276657,276658,276659,276660,276661,276662,276663,276664,276665,276666,276667,276668,276669,276670,276671,276672,276673)) and (`s2cart`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "42.01",
        "eval_cost": "2.00",
        "prefix_cost": "44.01",
        "data_read_per_join": "151K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ]
    }
  }
}

Result

product_id short_description full_description
276654 Miniature Circuit Breaker - SH203M - 3P - C
276655 Miniature Circuit Breaker - SH203M - 3P - C
276656 Miniature Circuit Breaker - SH203M - 3P - C
276657 Miniature Circuit Breaker - SH203M - 3P - C
276658 Miniature Circuit Breaker - SH203M - 3P - C
276659 Miniature Circuit Breaker - SH203M - 3P - C
276660 Miniature Circuit Breaker - SH203M - 3P - C
276661 Miniature Circuit Breaker - SH203M - 3P - C
276662 Miniature Circuit Breaker - SH203M - 3P - C
276663 Miniature Circuit Breaker - SH204M - 4P - C
276664 Miniature Circuit Breaker - SH204M - 4P - C
276665 Miniature Circuit Breaker - SH204M - 4P - C
276666 Miniature Circuit Breaker - SH204M - 4P - C
276667 Miniature Circuit Breaker - SH204M - 4P - C
276668 Miniature Circuit Breaker - SH204M - 4P - C
276669 Miniature Circuit Breaker - SH204M - 4P - C
276670 Miniature Circuit Breaker - SH204M - 4P - C
276671 Miniature Circuit Breaker - SH204M - 4P - C
276672 Miniature Circuit Breaker - SH204M - 4P - C
276673 Miniature Circuit Breaker - SH204M - 4P - C