Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd313685f837f0c3d0478259ecae4344b3a03bbc9de0d27cea3661ba52fc3c89f' 
  AND token = 'Ysi0q4WIRB5pJqeqzXMLRui8VOY6DvxWvNnPqwi6Yas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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