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 (
    85091, 85092, 85177, 85178, 85223, 85224, 
    85269, 85270, 85105, 89812, 89813, 
    89864, 89865, 89936, 89937, 91502, 
    91503, 89772, 85300, 85301, 85397, 
    85398, 85448, 85449, 85499, 85500, 
    85131, 85132, 83580, 85346, 85347, 
    85068, 85154, 85200, 85246, 89827, 
    89879, 89951, 91517, 83566, 85108, 
    86517, 86518, 86793, 86794, 82837, 
    82910, 82983, 83397, 83407, 86140, 
    86163, 86648, 86717, 83448, 83453, 
    89760, 89761, 89811, 89863, 89935, 
    91501, 85299, 85396, 85447, 85498, 
    85328, 85329, 85425, 85426, 85476, 
    85477, 85527, 85528, 85090, 85176, 
    85222, 85268, 85345, 83066, 83067, 
    83619, 83620, 89775, 90902, 90903, 
    90981, 90982, 82611, 85374, 85375, 
    82638, 83535, 85130, 89814, 89866
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00184

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 (85091,85092,85177,85178,85223,85224,85269,85270,85105,89812,89813,89864,89865,89936,89937,91502,91503,89772,85300,85301,85397,85398,85448,85449,85499,85500,85131,85132,83580,85346,85347,85068,85154,85200,85246,89827,89879,89951,91517,83566,85108,86517,86518,86793,86794,82837,82910,82983,83397,83407,86140,86163,86648,86717,83448,83453,89760,89761,89811,89863,89935,91501,85299,85396,85447,85498,85328,85329,85425,85426,85476,85477,85527,85528,85090,85176,85222,85268,85345,83066,83067,83619,83620,89775,90902,90903,90981,90982,82611,85374,85375,82638,83535,85130,89814,89866)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}