Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781d49d99823bff01a0d7f8b966c92fd9ae3a423ef4fead147a1cab7013d3ec5' 
  AND token = '8B53XfBw3nsv0j26O3UjlNFYdxLeb3VRq4hYWFwUe1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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