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 (
    87185, 87202, 87219, 90802, 87186, 87203, 
    87220, 90803, 87183, 87200, 87217, 
    90800, 87148, 87149, 87150, 87151, 
    87152, 87153, 87286, 87181, 87198, 
    87215, 90798, 87184, 87201, 87218, 
    90801, 85014, 85020, 85026, 85032, 
    87182, 87199, 87216, 90799, 87154, 
    87155, 87156, 87157, 87158, 87159, 
    87287, 87180, 87197, 87214, 85018, 
    85024, 85030
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00111

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 (87185,87202,87219,90802,87186,87203,87220,90803,87183,87200,87217,90800,87148,87149,87150,87151,87152,87153,87286,87181,87198,87215,90798,87184,87201,87218,90801,85014,85020,85026,85032,87182,87199,87216,90799,87154,87155,87156,87157,87158,87159,87287,87180,87197,87214,85018,85024,85030)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}