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 (
    87148, 87149, 87150, 87151, 87152, 87153, 
    87286, 87154, 87155, 87156, 87157, 
    87158, 87159, 87287, 87142, 87143, 
    87144, 87145, 87146, 87147, 87285, 
    87172, 87173, 87174, 87175, 87176, 
    87177, 87160, 87161, 87162, 87163, 
    87164, 87165, 87166, 87167, 87168, 
    87169, 87170, 87171, 87136, 87137, 
    87138, 87139, 87140, 87141, 87284, 
    84701, 88959
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (87148,87149,87150,87151,87152,87153,87286,87154,87155,87156,87157,87158,87159,87287,87142,87143,87144,87145,87146,87147,87285,87172,87173,87174,87175,87176,87177,87160,87161,87162,87163,87164,87165,87166,87167,87168,87169,87170,87171,87136,87137,87138,87139,87140,87141,87284,84701,88959)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}