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 (
    427214, 390160, 389481, 389483, 427216, 
    388722, 427215, 388890, 390264, 389298, 
    389462, 388844, 390175, 389444, 388558, 
    388967, 389836, 388455, 390211, 388642, 
    415655, 389567, 389347, 415501, 389591, 
    389854, 390309, 390251, 390226, 389834, 
    388395, 388497, 389163, 388912, 415654, 
    415656, 415382, 388942, 415377, 415495, 
    390245, 389852, 389054, 390237, 415469, 
    390205, 390305, 389833, 415531, 389229, 
    389487, 415663, 389432, 388953, 390193, 
    388447, 388963, 390223, 388957, 389431, 
    388574, 389542, 388453, 390122, 426897, 
    389873, 390161, 390273, 389522, 388958, 
    390135, 389263, 389558, 389452, 388422, 
    390224, 388479, 388513, 390192, 390209, 
    390257, 415496, 389507, 388544, 388454, 
    390198, 389359, 390316, 389532, 390129, 
    390164, 390243, 389428, 389827
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00314

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "131.77"
    },
    "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": 94,
      "rows_produced_per_join": 94,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "112.97",
        "eval_cost": "18.80",
        "prefix_cost": "131.77",
        "data_read_per_join": "641K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`webmarco`.`cscart_product_descriptions`.`product_id` in (427214,390160,389481,389483,427216,388722,427215,388890,390264,389298,389462,388844,390175,389444,388558,388967,389836,388455,390211,388642,415655,389567,389347,415501,389591,389854,390309,390251,390226,389834,388395,388497,389163,388912,415654,415656,415382,388942,415377,415495,390245,389852,389054,390237,415469,390205,390305,389833,415531,389229,389487,415663,389432,388953,390193,388447,388963,390223,388957,389431,388574,389542,388453,390122,426897,389873,390161,390273,389522,388958,390135,389263,389558,389452,388422,390224,388479,388513,390192,390209,390257,415496,389507,388544,388454,390198,389359,390316,389532,390129,390164,390243,389428,389827)) and (`webmarco`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}