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 (
    94378, 94379, 94380, 94438, 94463, 94464, 
    94465, 94466, 94467, 94468, 94469, 
    94470, 94471, 94472, 94473, 94474, 
    94475, 94476, 94477, 94478, 94479, 
    94480, 94481, 94482, 94483, 94589, 
    94590, 94591, 94811, 94812, 94820, 
    94821, 94959, 94960, 94961, 94962, 
    94963, 94964, 95360, 95394, 95395, 
    95396, 95397, 95398, 95399, 95400, 
    95401, 95424
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00111

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (94378,94379,94380,94438,94463,94464,94465,94466,94467,94468,94469,94470,94471,94472,94473,94474,94475,94476,94477,94478,94479,94480,94481,94482,94483,94589,94590,94591,94811,94812,94820,94821,94959,94960,94961,94962,94963,94964,95360,95394,95395,95396,95397,95398,95399,95400,95401,95424)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}