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 (
    19645, 19646, 19647, 19648, 19649, 19650, 
    19651, 19652, 19653, 19654, 19655, 
    19656, 19657, 19658, 19659, 19660
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00113

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 (19645,19646,19647,19648,19649,19650,19651,19652,19653,19654,19655,19656,19657,19658,19659,19660) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19645 Cover-rear combination lamp, left<p>Part number 92411G9600</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19646 Cover-rear combination lamp, right<p>Part number 92421G9600</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19647 Garnish-rear combination lamp, left<p>Part number 92435G9500NCM</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19648 Garnish-rear combination lamp, right<p>Part number 92436G9500NCM</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19649 Lamp Assembly-Vanity<p>Part number 92890D2500VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19650 Switch assembly - multi-function<p>Part number 93406G9561NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19651 Cluster Assembly - Instrumentation<p>Part number 94073G9AC0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19652 Unit assembly-integrated body control module<p>Part number 95400G9PE2</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19653 Unit assembly-video recording system<p>Part number 95720G9120</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19654 Cover Assembly - Multi-Sensor<p>Part number 96030G9500VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19655 Cover - Multi-Sensor Blanking<p>Part number 96032G9500VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19656 Antenna Assembly - Combination<p>Part number 96210G9850NCM</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19657 Feeder cable-antenna main NO.1<p>Part number 96220G9670</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19658 Head Unit Assembly - AVN<p>Part number 96560G9GD0VCA</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19659 Motor & Pump Assembly - Windshield Washer<p>Part number 98510M4000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19660 Reservoir & Pump Assembly-Washer<p>Part number 98610G9600</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>