Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bf1e0717adfb4131e78365eeb22917f6296e0a8efb0c715c85d9bb1820c4d6' 
  AND token = '3bgyNTcw+tZ4jbipQM4QS4YYitQJAMw9AEJXpmwKUxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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