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 (
    86524, 86800, 85124, 85125, 89075, 89076, 
    85360, 86500, 86776, 86147, 86148, 
    86170, 86171, 86663, 86664, 86732, 
    86733, 82819, 82892, 82965, 83073, 
    83626, 90909, 90988, 85083, 85169, 
    85215, 85261, 89074, 85123, 86195, 
    86218, 86527, 86803, 89079, 89080, 
    85320, 85321, 85417, 85418, 85468, 
    85469, 85519, 85520, 86184, 86185, 
    86207, 86208, 86508, 86509, 86784, 
    86785, 82855, 82856, 82928, 82929, 
    83001, 83002, 83517, 83518, 83525, 
    83526, 85366, 85367, 86146, 86169, 
    86662, 86731, 89071, 89072, 82600, 
    83076, 83629, 90912, 90991, 86638, 
    86707, 85086, 85172, 85218, 85264, 
    83057, 83058, 83606, 83607, 89825, 
    89826, 89877, 89878, 89949, 89950, 
    90893, 90894, 90972, 90973, 91515
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00243

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 (86524,86800,85124,85125,89075,89076,85360,86500,86776,86147,86148,86170,86171,86663,86664,86732,86733,82819,82892,82965,83073,83626,90909,90988,85083,85169,85215,85261,89074,85123,86195,86218,86527,86803,89079,89080,85320,85321,85417,85418,85468,85469,85519,85520,86184,86185,86207,86208,86508,86509,86784,86785,82855,82856,82928,82929,83001,83002,83517,83518,83525,83526,85366,85367,86146,86169,86662,86731,89071,89072,82600,83076,83629,90912,90991,86638,86707,85086,85172,85218,85264,83057,83058,83606,83607,89825,89826,89877,89878,89949,89950,90893,90894,90972,90973,91515)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}