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 (
    87325, 87336, 87337, 87348, 87349, 86482, 
    86484, 86758, 86760, 83582, 83583, 
    83584, 83585, 86479, 86755, 91118, 
    91119, 91204, 91205, 91259, 91260, 
    82615, 82617, 82625, 82626, 83418, 
    83420, 83490, 83491, 86651, 86720, 
    87300, 87301, 82612, 83411, 91149, 
    91150, 86480, 86756, 85073, 85159, 
    85205, 85251, 82613, 83416, 83031, 
    83033, 83588, 83590, 90867, 90869, 
    90946, 90948, 82623, 83488, 85070, 
    85156, 85202, 85248, 85113, 83233, 
    83234, 83028, 83581, 90864, 90943, 
    82843, 82916, 82989, 83473, 83481, 
    85110, 85071, 85157, 85203, 85249, 
    83029, 83227, 83232, 83586, 90865, 
    90944, 85111, 86620, 86622, 86689, 
    86691, 83042, 83044, 90878, 90880, 
    90957, 90959, 84810, 84811, 84828
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00191

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 (87325,87336,87337,87348,87349,86482,86484,86758,86760,83582,83583,83584,83585,86479,86755,91118,91119,91204,91205,91259,91260,82615,82617,82625,82626,83418,83420,83490,83491,86651,86720,87300,87301,82612,83411,91149,91150,86480,86756,85073,85159,85205,85251,82613,83416,83031,83033,83588,83590,90867,90869,90946,90948,82623,83488,85070,85156,85202,85248,85113,83233,83234,83028,83581,90864,90943,82843,82916,82989,83473,83481,85110,85071,85157,85203,85249,83029,83227,83232,83586,90865,90944,85111,86620,86622,86689,86691,83042,83044,90878,90880,90957,90959,84810,84811,84828)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}