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 (
    82836, 82907, 82909, 82980, 82982, 83394, 
    83396, 83404, 83406, 85053, 85127, 
    85139, 85185, 85231, 86149, 86172, 
    86186, 86209, 86510, 86665, 86734, 
    86786, 83056, 83605, 86514, 86515, 
    86790, 86791, 88581, 90892, 90971, 
    84327, 84328, 90002, 85106, 85107, 
    84628, 85059, 85145, 85191, 85237, 
    82801, 82831, 82874, 82904, 82947, 
    82977, 83391, 83401, 85051, 85137, 
    85183, 85229, 89802, 89854, 89926, 
    91078, 91079, 91492, 85016, 85022, 
    85028, 85034, 89808, 89810, 89860, 
    89862, 89932, 89934, 91498, 91500, 
    82584, 82585, 86129, 86130, 86152, 
    86153, 85099, 85296, 85298, 85393, 
    85395, 85444, 85446, 85495, 85497, 
    89805, 89857, 89929, 91495, 85047, 
    89824, 89876, 89948, 91514, 82832
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00158

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 (82836,82907,82909,82980,82982,83394,83396,83404,83406,85053,85127,85139,85185,85231,86149,86172,86186,86209,86510,86665,86734,86786,83056,83605,86514,86515,86790,86791,88581,90892,90971,84327,84328,90002,85106,85107,84628,85059,85145,85191,85237,82801,82831,82874,82904,82947,82977,83391,83401,85051,85137,85183,85229,89802,89854,89926,91078,91079,91492,85016,85022,85028,85034,89808,89810,89860,89862,89932,89934,91498,91500,82584,82585,86129,86130,86152,86153,85099,85296,85298,85393,85395,85444,85446,85495,85497,89805,89857,89929,91495,85047,89824,89876,89948,91514,82832)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}