Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9899d227db6f7f5eb746bb5ff0fd898aed618d18a997c46b902733db4a35c625' 
  AND token = 'kj4LWa+qb3OdyK5NksuPKrAZMPHOHgUr48frrcUCWuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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