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 (
    86688, 86690, 83041, 83043, 90877, 90879, 
    90956, 90958, 91070, 91071, 91073, 
    91074, 91075, 89815, 89867, 89939, 
    91505, 82841, 82914, 82987, 85303, 
    85400, 85451, 85502, 86492, 86494, 
    86768, 86770, 84663, 84664, 85306, 
    85308, 85403, 85405, 85454, 85456, 
    85505, 85507, 91114, 91116, 91120, 
    91122, 91125, 91127, 91129, 91200, 
    91202, 91206, 91208, 91211, 91213, 
    91215, 91255, 91257, 91261, 91263, 
    91266, 91268, 91270, 85352, 85354, 
    85349, 91145, 91147, 91151, 91153, 
    91156, 91158, 91160, 82811, 82813, 
    82884, 82886, 82957, 82959, 83331, 
    83333, 83341, 83343, 89493, 89494, 
    89501, 89502, 89509, 89510, 89517, 
    89518, 84302, 84303, 90567, 90573, 
    90579, 82592, 82594, 83355, 83357
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00241

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 (86688,86690,83041,83043,90877,90879,90956,90958,91070,91071,91073,91074,91075,89815,89867,89939,91505,82841,82914,82987,85303,85400,85451,85502,86492,86494,86768,86770,84663,84664,85306,85308,85403,85405,85454,85456,85505,85507,91114,91116,91120,91122,91125,91127,91129,91200,91202,91206,91208,91211,91213,91215,91255,91257,91261,91263,91266,91268,91270,85352,85354,85349,91145,91147,91151,91153,91156,91158,91160,82811,82813,82884,82886,82957,82959,83331,83333,83341,83343,89493,89494,89501,89502,89509,89510,89517,89518,84302,84303,90567,90573,90579,82592,82594,83355,83357)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}