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 (
    83604, 84525, 84526, 84591, 84592, 90889, 
    90891, 90968, 90970, 82631, 82855, 
    82856, 82928, 82929, 83001, 83002, 
    83517, 83518, 83525, 83526, 83528, 
    83022, 83023, 90858, 90859, 90937, 
    90938, 83050, 83595, 84675, 84676, 
    90886, 90965, 84629, 84630, 85366, 
    85367, 89765, 84820, 84821, 91168, 
    86146, 86169, 86662, 86731, 86607, 
    86676, 84348, 89071, 89072, 89768, 
    83051, 83600, 90887, 90966, 89429, 
    89821, 89873, 89945, 91511, 82863, 
    82936, 83009, 83445, 83450, 83020, 
    90856, 90935, 87306, 87307, 87318, 
    87319, 87330, 87331, 87342, 87343, 
    82600, 83076, 83629, 90912, 90991, 
    86638, 86707, 82717, 83455, 85086, 
    85172, 85218, 85264, 83079, 83080, 
    83577, 83579, 90916, 90918, 90995
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00190

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (83604,84525,84526,84591,84592,90889,90891,90968,90970,82631,82855,82856,82928,82929,83001,83002,83517,83518,83525,83526,83528,83022,83023,90858,90859,90937,90938,83050,83595,84675,84676,90886,90965,84629,84630,85366,85367,89765,84820,84821,91168,86146,86169,86662,86731,86607,86676,84348,89071,89072,89768,83051,83600,90887,90966,89429,89821,89873,89945,91511,82863,82936,83009,83445,83450,83020,90856,90935,87306,87307,87318,87319,87330,87331,87342,87343,82600,83076,83629,90912,90991,86638,86707,82717,83455,85086,85172,85218,85264,83079,83080,83577,83579,90916,90918,90995)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}