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 (
    85673, 85693, 85705, 85717, 87551, 88404, 
    88658, 88700, 88705, 88747, 87448, 
    87460, 88492, 88500, 89453, 89466, 
    89474, 89482, 91434, 91442, 91448, 
    91456, 84764, 85659, 85681, 89019, 
    89104, 89112, 88752, 88794, 88795, 
    87504, 87520, 88444, 88462, 88478, 
    89458, 85728, 85745, 85755, 85765, 
    90831, 88553, 89976, 89977, 89978, 
    87463, 87550, 88497, 91453, 85735, 
    84704, 84707, 91054, 88669, 88716, 
    84773, 84786, 84795, 89979, 89980, 
    89981, 88191, 88199, 88203, 88211, 
    84777, 87536, 88399, 88551, 88066, 
    88196, 88208, 88509, 88513, 88950, 
    88951, 88952, 88498, 88657, 88698, 
    88699, 88704, 88745, 88746, 91440, 
    91454, 85725, 85742, 85752, 85762, 
    88559, 85732, 88493, 91435, 91449
  ) 
  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 (85673,85693,85705,85717,87551,88404,88658,88700,88705,88747,87448,87460,88492,88500,89453,89466,89474,89482,91434,91442,91448,91456,84764,85659,85681,89019,89104,89112,88752,88794,88795,87504,87520,88444,88462,88478,89458,85728,85745,85755,85765,90831,88553,89976,89977,89978,87463,87550,88497,91453,85735,84704,84707,91054,88669,88716,84773,84786,84795,89979,89980,89981,88191,88199,88203,88211,84777,87536,88399,88551,88066,88196,88208,88509,88513,88950,88951,88952,88498,88657,88698,88699,88704,88745,88746,91440,91454,85725,85742,85752,85762,88559,85732,88493,91435,91449)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}