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 (
    101022, 101023, 101024, 101025, 101026, 
    101027, 101028, 101029, 101030, 101031, 
    101032, 101033, 101034, 101035, 101107, 
    101108, 101109, 101110, 101111, 101116, 
    101117, 101118, 101119, 101120, 101125, 
    101126, 101127, 101128, 101129, 101509, 
    101510, 101511, 101512, 101513, 101518, 
    101519, 101520, 101521, 101522, 101527, 
    101528, 101529, 101530, 101531, 101547, 
    101548, 101549, 101550, 101551, 101556, 
    101557, 101558, 101559, 101560, 101565, 
    101566, 101567, 101568, 101569, 101794, 
    101795, 101796, 101797, 101798, 101799, 
    101800, 101801, 101802, 101803, 101804, 
    101805, 101806, 101807, 101808, 101809, 
    101810, 101811, 101812, 101813
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00143

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "35.59"
    },
    "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": 79,
      "rows_produced_per_join": 79,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "27.69",
        "eval_cost": "7.90",
        "prefix_cost": "35.59",
        "data_read_per_join": "301K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (101022,101023,101024,101025,101026,101027,101028,101029,101030,101031,101032,101033,101034,101035,101107,101108,101109,101110,101111,101116,101117,101118,101119,101120,101125,101126,101127,101128,101129,101509,101510,101511,101512,101513,101518,101519,101520,101521,101522,101527,101528,101529,101530,101531,101547,101548,101549,101550,101551,101556,101557,101558,101559,101560,101565,101566,101567,101568,101569,101794,101795,101796,101797,101798,101799,101800,101801,101802,101803,101804,101805,101806,101807,101808,101809,101810,101811,101812,101813)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}