Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18c9204080c379382484628befe9ab9b781da592ec5e68b6cfa450e9ab3ec76' 
  AND token = 'JFE6tEsC/nf7fKIaKIvbVNlRObb/ogoya4dq0UaL7oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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