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, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    19373, 19374, 19375, 19376, 19377, 19378, 
    19379, 19380, 19381, 19382, 19383, 
    19384, 19385, 19386, 19387, 19388
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "idx_product_lang"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (19373,19374,19375,19376,19377,19378,19379,19380,19381,19382,19383,19384,19385,19386,19387,19388) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19373 Inside cover-front, left<p>Part number 88172G9000NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19374 Shield cover - front seat outer, left<p>Part number 88170G9010NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19375 Shield cover - front seat outer, right<p>Part number 88270G9160NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19376 Track Assembly-Right<p>Part number 88600G9EB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19377 Wire Harness - Power<p>Part number 88580G9021</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19378 Switch assembly - power front seat left<p>Part number 88540G9011NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19379 Headrest Assembly - Front Seat<p>Part number 88700G9120XK7</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19380 Unit-ODU(PODS)<p>Part number 80701G9000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19381 Track-Assembly-Left<p>Part number 88500G9EB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19382 Wiring Assembly-Main<p>Part number 911A2G9100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19383 Junction box assembly - instrument panel<p>Part number 91953G9021</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19384 Wiring Assembly-Front<p>Part number 912F0G9363</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19385 Upper Cover - Engine Room Box<p>Part number 91956G9210</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19386 Wiring Assembly-Control<p>Part number 91415G9130</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19387 Protector-wiring<p>Part number 91970G9195</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19388 Bracket-wiring mounting<p>Part number 91931B1460</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>