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 (
    83533, 83534, 89769, 85129, 86132, 86155, 
    86640, 86709, 82854, 82927, 83000, 
    83516, 83524, 86175, 86176, 86198, 
    86199, 84497, 84498, 84563, 84564, 
    82803, 82804, 82876, 82877, 82949, 
    82950, 83021, 85101, 89049, 89050, 
    90857, 90936, 91102, 91103, 91188, 
    91189, 91243, 91244, 85365, 89803, 
    89804, 89855, 89856, 89927, 89928, 
    91493, 91494, 85840, 85841, 84649, 
    84650, 87302, 87303, 89070, 83613, 
    85087, 85173, 85219, 85265, 82830, 
    82903, 82976, 89801, 89853, 89925, 
    91491, 85066, 85067, 85152, 85153, 
    85198, 85199, 85244, 85245, 89773, 
    89774, 84345, 84346, 86173, 86174, 
    86196, 86197, 85856, 85857, 85866, 
    85867, 86138, 86139, 86161, 86162, 
    86646, 86647, 86715, 86716, 82834
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00168

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 (83533,83534,89769,85129,86132,86155,86640,86709,82854,82927,83000,83516,83524,86175,86176,86198,86199,84497,84498,84563,84564,82803,82804,82876,82877,82949,82950,83021,85101,89049,89050,90857,90936,91102,91103,91188,91189,91243,91244,85365,89803,89804,89855,89856,89927,89928,91493,91494,85840,85841,84649,84650,87302,87303,89070,83613,85087,85173,85219,85265,82830,82903,82976,89801,89853,89925,91491,85066,85067,85152,85153,85198,85199,85244,85245,89773,89774,84345,84346,86173,86174,86196,86197,85856,85857,85866,85867,86138,86139,86161,86162,86646,86647,86715,86716,82834)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}