Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e181f68695248b37e6598c98e62333a87ed72a92b653d2bac76c2040e3fa62ce' 
  AND token = 'qadj6Ur9/4yRsQIeiH2/EvfqHcgrOCU3MWm3bTeF59M=' 
  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"
    }
  }
}