Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c767866a4aeb3d966dd7df2b9bbed5bed0663aef2a8ce8e9d42e7e0221000258' 
  AND token = '1XkGUzm2+mtDoLlrsHuaapdhakoLF5nKM3M21y5sK+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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