Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dca1eeffe333ead43094eadb78e33a0903d0710ee66c39ed239813407890dc' 
  AND token = 'WJIs5JFkLfwHmXvHdMN+MFtuxgpEuYPezPvjAWPnfRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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