Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bba1eaeff9d9f5468307bb5ee861f19fd05a3f6e46c8d866d13a3c3f98fbc2' 
  AND token = '6JnEoXUXC+k8O8tRq/yqIyHhO0bqogBOlE+AxljA6T8=' 
  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"
    }
  }
}