Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386137a8f1a2d3f43e02a4bdca4ac5cbec0281164a83341dcc6cec3adb1d12c7' 
  AND token = '+nuJpyI6AmqTSCB8jVu3BkQpwqjKf6aV8kY75pxhj84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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