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 (
    85479, 86461, 86462, 86737, 86738, 90745, 
    90748, 90751, 90754, 84646, 86604, 
    86673, 83014, 83015, 83546, 83547, 
    90847, 90848, 90926, 90927, 90743, 
    90744, 90746, 90747, 90749, 90750, 
    90752, 90753, 85275, 90742, 82799, 
    82800, 82872, 82873, 82945, 82946, 
    83255, 83257, 83262, 83264, 82797, 
    82870, 82943, 83252, 83259, 84804, 
    84805, 84822, 84823, 84834, 84835, 
    91089, 91175, 91230, 83012, 83013, 
    83544, 83545, 90845, 90846, 90924, 
    90925, 88895, 90823, 91464, 91465, 
    91468, 91469, 90012, 90740, 90741, 
    84514, 84580, 84884, 84899, 88875, 
    88876, 88877, 88878, 88902, 88903, 
    82798, 82871, 82944, 83253, 83260, 
    84798, 84799, 86601, 86602, 86670, 
    86671, 91068, 84878, 82580, 82581
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00163

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 (85479,86461,86462,86737,86738,90745,90748,90751,90754,84646,86604,86673,83014,83015,83546,83547,90847,90848,90926,90927,90743,90744,90746,90747,90749,90750,90752,90753,85275,90742,82799,82800,82872,82873,82945,82946,83255,83257,83262,83264,82797,82870,82943,83252,83259,84804,84805,84822,84823,84834,84835,91089,91175,91230,83012,83013,83544,83545,90845,90846,90924,90925,88895,90823,91464,91465,91468,91469,90012,90740,90741,84514,84580,84884,84899,88875,88876,88877,88878,88902,88903,82798,82871,82944,83253,83260,84798,84799,86601,86602,86670,86671,91068,84878,82580,82581)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}