Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777ce39fbb4c660d1e6fc5766288832f0c98cd92892e5d5d8b187a707b91743a' 
  AND token = 'hdXEIkRN5oOJxB89ypfXdPnH6QwbPbhQRrPxyI7mk+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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