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 (
    17577, 17578, 17579, 17580, 17581, 17582, 
    17583, 17584, 17585, 17586, 17587, 
    17588, 17589, 17590, 17591, 17592
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00220

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 (17577,17578,17579,17580,17581,17582,17583,17584,17585,17586,17587,17588,17589,17590,17591,17592) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description unit_name
17577 Protector-wiring<p>Part number 91970B1250</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17578 Wiring Assembly - Follower<p>Part number 915U0G9640</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17579 Protector-wiring<p>Part number 91970J5170</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17580 grommet<p>Part number 91981J5090</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17581 grommet<p>Part number 91981B1031</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17582 grommet<p>Part number 91981B1041</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17583 Junction Box Assembly-Rear<p>Part number 91956G9011</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17584 Protector-wiring<p>Part number 91970G9210</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17585 Protector-wiring<p>Part number 91970G9120</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17586 Protector-wiring<p>Part number 91970G9130</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17587 Protector-wiring<p>Part number 91970G9160</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17588 Protector-wiring<p>Part number 91970J5130</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17589 Protector-wiring<p>Part number 91970J5150</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17590 Protector-wiring<p>Part number 91970J5160</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17591 Protector-wiring<p>Part number 91970J5190</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
17592 Plug-S/ABS housing, right<p>Part number 919803M020</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>