Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf6666ba0c7b2c888baf4323708fc5ba9cd47d3578a872968e529be9db6723f' 
  AND token = 'qiHG61+VBw9wEDTTu+9EPEc2mlYlAtAEXYB279yQX+o=' 
  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"
    }
  }
}