Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c80db7da49364cbef303a939cb9c1653999ac7114090c28aecbf65c899bf4f' 
  AND token = 'wsc8COXcMqE1qwF4JSzwny48Eoihd7ygnB+NmJTxLZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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