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 (
    84688, 84712, 87979, 84960, 87976, 87978, 
    84850, 84743, 84849, 84951, 84747, 
    84761, 84711, 84710, 84911, 84717, 
    87969, 87967, 88038, 84846, 84910, 
    87981, 87982, 85274, 84687, 84709, 
    87977, 87918, 87919, 87920, 87924, 
    87926, 87930, 87931, 87932, 88027, 
    88089, 84940, 84941, 88024, 87898, 
    87899, 87902, 87968, 84728, 84729, 
    84730, 88022
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00104

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 (84688,84712,87979,84960,87976,87978,84850,84743,84849,84951,84747,84761,84711,84710,84911,84717,87969,87967,88038,84846,84910,87981,87982,85274,84687,84709,87977,87918,87919,87920,87924,87926,87930,87931,87932,88027,88089,84940,84941,88024,87898,87899,87902,87968,84728,84729,84730,88022)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}