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 (
    90108, 89006, 89013, 84007, 84009, 84011, 
    84013, 89010, 91307, 83963, 83965, 
    83967, 83969, 91303, 83130, 84006, 
    84008, 84010, 84012, 84035, 90089, 
    90099, 92027, 92028, 92029, 92030, 
    92031, 92032, 92033, 92035, 92036, 
    92037, 92038, 92039, 92040, 92041, 
    92115, 92116, 92117, 92118, 92119, 
    92120, 92121, 92123, 92124, 92125, 
    92126, 92127, 92128, 92129, 83962, 
    83964, 83966, 83968, 89005, 90079, 
    83111, 83121, 92255, 92256, 92257, 
    92496, 92497, 92498, 92499, 91296, 
    83101, 84107, 83999, 84001, 84003, 
    84005, 92051, 92052, 92053, 92054, 
    92055, 92056, 92057, 91550, 91619, 
    91788, 91789, 91790, 91791, 91792, 
    91793, 91794, 91795, 92254, 92026, 
    92034, 92114, 92122, 92501, 92502
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00163

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 (90108,89006,89013,84007,84009,84011,84013,89010,91307,83963,83965,83967,83969,91303,83130,84006,84008,84010,84012,84035,90089,90099,92027,92028,92029,92030,92031,92032,92033,92035,92036,92037,92038,92039,92040,92041,92115,92116,92117,92118,92119,92120,92121,92123,92124,92125,92126,92127,92128,92129,83962,83964,83966,83968,89005,90079,83111,83121,92255,92256,92257,92496,92497,92498,92499,91296,83101,84107,83999,84001,84003,84005,92051,92052,92053,92054,92055,92056,92057,91550,91619,91788,91789,91790,91791,91792,91793,91794,91795,92254,92026,92034,92114,92122,92501,92502)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}