Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b31e7ca5ab0208944c3c8ea161b7a49634fac6e20eadf6a5f3c1bb35c828694' 
  AND token = 'I//chvrwvq+oFoiIa1QJC9LYbTtwNrfIREmvyP+pUFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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