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, 100912, 101107, 101108, 
    101109, 101116, 101117, 101118, 101125, 
    101126, 101127, 101509, 101510, 101511, 
    101518, 101519, 101520, 101527, 101528, 
    101529, 101547, 101548, 101549, 101556, 
    101557, 101558, 101565, 101566, 101567, 
    101804, 101805, 101806, 101807, 101808, 
    101809, 101810, 101811, 101812, 101813
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00142

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "38.74"
    },
    "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": 86,
      "rows_produced_per_join": 86,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "30.14",
        "eval_cost": "8.60",
        "prefix_cost": "38.74",
        "data_read_per_join": "327K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (99021,99023,99025,99528,99562,99563,99564,99565,100144,100147,100149,100293,100295,100483,100488,100492,100497,100537,100539,100595,100597,100612,100616,100618,100619,100621,100622,100624,100626,100627,100629,100631,100633,100635,100637,100639,100641,100645,100880,100881,100883,100890,100893,100894,100895,100897,100899,100906,100912,101107,101108,101109,101116,101117,101118,101125,101126,101127,101509,101510,101511,101518,101519,101520,101527,101528,101529,101547,101548,101549,101556,101557,101558,101565,101566,101567,101804,101805,101806,101807,101808,101809,101810,101811,101812,101813)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}