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 (
    89076, 90546, 84522, 84523, 84588, 84589, 
    85360, 89817, 89869, 89941, 91507, 
    83082, 83610, 86143, 86166, 86500, 
    86659, 86728, 86776, 89069, 90921, 
    91000, 84337, 85315, 85412, 85463, 
    85514, 86469, 86745, 84808, 84809, 
    84826, 84827, 84838, 84839, 91106, 
    91192, 91247, 84546, 84612, 82850, 
    82923, 82996, 83512, 83520, 90007, 
    89766, 89767, 83596, 83597, 83598, 
    83599, 85361, 86147, 86148, 86170, 
    86171, 86663, 86664, 86732, 86733, 
    89052, 86180, 86182, 86203, 86205, 
    86504, 86506, 86780, 86782, 89822, 
    89823, 89874, 89875, 89946, 89947, 
    91512, 91513, 82864, 82865, 82937, 
    82938, 83010, 83011, 83446, 83447, 
    83451, 83452, 82819, 82892, 82965, 
    86177, 86200, 86501, 86777, 84802
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00176

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 (89076,90546,84522,84523,84588,84589,85360,89817,89869,89941,91507,83082,83610,86143,86166,86500,86659,86728,86776,89069,90921,91000,84337,85315,85412,85463,85514,86469,86745,84808,84809,84826,84827,84838,84839,91106,91192,91247,84546,84612,82850,82923,82996,83512,83520,90007,89766,89767,83596,83597,83598,83599,85361,86147,86148,86170,86171,86663,86664,86732,86733,89052,86180,86182,86203,86205,86504,86506,86780,86782,89822,89823,89874,89875,89946,89947,91512,91513,82864,82865,82937,82938,83010,83011,83446,83447,83451,83452,82819,82892,82965,86177,86200,86501,86777,84802)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}