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 (
    99021, 99023, 99025, 99528, 99562, 99563, 
    99564, 99565, 100144, 100147, 100149, 
    100293, 100295, 100483, 100488, 100492, 
    100497, 100537, 100539, 100595, 100597, 
    100612, 100616, 100618, 100619, 100621, 
    100622, 100624, 100626, 100627, 100629, 
    100631, 100633, 100635, 100637, 100639, 
    100641, 100645, 100880, 100881, 100883, 
    100890, 100893, 100894, 100895, 100897, 
    100899, 100906
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00100

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 (99021,99023,99025,99528,99562,99563,99564,99565,100144,100147,100149,100293,100295,100483,100488,100492,100497,100537,100539,100595,100597,100612,100616,100618,100619,100621,100622,100624,100626,100627,100629,100631,100633,100635,100637,100639,100641,100645,100880,100881,100883,100890,100893,100894,100895,100897,100899,100906)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}