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 (
    90007, 89766, 89767, 82864, 82865, 82937, 
    82938, 83010, 83011, 83446, 83447, 
    83451, 83452, 84802, 84803, 91082, 
    82718, 82719, 83456, 83457, 89764, 
    86470, 86746, 82862, 82935, 83008, 
    83444, 83449, 82716, 83454, 86609, 
    86610, 86678, 86679, 83022, 83023, 
    90858, 90859, 90937, 90938, 89765, 
    86607, 86676, 82863, 82936, 83009, 
    83445, 83450, 83020, 90856, 90935, 
    82717, 83455, 83079, 83080, 83577, 
    83579, 90916, 90918, 90995, 90997, 
    83077, 83574, 90913, 90992, 90003, 
    83078, 83575, 90914, 90993, 86608, 
    86677, 82803, 82804, 82876, 82877, 
    82949, 82950, 83021, 90857, 90936, 
    91102, 91103, 91188, 91189, 91243, 
    91244, 89803, 89804, 89855, 89856, 
    89927, 89928, 91493, 91494, 89801
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00109

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 (90007,89766,89767,82864,82865,82937,82938,83010,83011,83446,83447,83451,83452,84802,84803,91082,82718,82719,83456,83457,89764,86470,86746,82862,82935,83008,83444,83449,82716,83454,86609,86610,86678,86679,83022,83023,90858,90859,90937,90938,89765,86607,86676,82863,82936,83009,83445,83450,83020,90856,90935,82717,83455,83079,83080,83577,83579,90916,90918,90995,90997,83077,83574,90913,90992,90003,83078,83575,90914,90993,86608,86677,82803,82804,82876,82877,82949,82950,83021,90857,90936,91102,91103,91188,91189,91243,91244,89803,89804,89855,89856,89927,89928,91493,91494,89801)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}