SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a32b28027b5938f4a9452e10140432b12449beed39011ea9e215455aa89a937' 
  AND token = 'CkpBZiDuzSB4P06hJY5wfqNIXB/QVzIGZh4K83gmEBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}