What is the better way to select minimum value within join? - mysql

Question

I've three tables where I want to select the oldest media according to date from a joined table. The query is working fine but I want to know if its correct solution for performance or there is a better way to do this.
SELECT product.`product_id`, product.`title`, product.`price`,
media_gallery.`thumbnail`, product.`special_price`
FROM product
LEFT JOIN
(SELECT product_media.`product_id`, product_media.`media_id`
FROM product_media ORDER BY product_media.`added_on` ASC LIMIT 1) product_media
ON product.`product_id` = product_media.`product_id`
LEFT JOIN media_gallery ON product_media.`media_id` = media_gallery.`media_id`
GROUP BY product.`product_id`
LIMIT 10
I've three tables from which I want to select the products with single image and the image should be the oldest. The image is stored in media_gallery and the image is assigned in product_media. The product can have multiple images which are referenced in product_media. I want to select product_id, product.title, product.price, product.special_price, media_gallery.thumbnail. The thumbnail should be the image added as earliest
CREATE TABLE `product_media` (
`id` varchar(60) NOT NULL,
`product_id` varchar(50) NOT NULL,
`media_id` varchar(50) NOT NULL,
`added_on` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`),
UNIQUE KEY `product_id_2` (`product_id`,`media_id`),
KEY `product_id` (`product_id`),
KEY `media_id` (`media_id`),
CONSTRAINT `product_media_ibfk_1` FOREIGN KEY (`product_id`) REFERENCES `product` (`product_id`) ON DELETE CASCADE ON UPDATE NO ACTION,
CONSTRAINT `product_media_ibfk_2` FOREIGN KEY (`media_id`) REFERENCES `media_gallery` (`media_id`) ON DELETE CASCADE ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `media_gallery` (
`media_id` varchar(50) NOT NULL,
`media_type` varchar(10) NOT NULL,
`media_title` varchar(100) DEFAULT NULL,
`media_url` varchar(255) NOT NULL,
`thumbnail` varchar(255) NOT NULL,
`added_on` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`media_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `product` (
`product_id` varchar(50) NOT NULL,
`title` varchar(255) NOT NULL,
`description` varchar(2000) DEFAULT NULL,
`price` decimal(10,2) NOT NULL,
`special_price` decimal(10,2) DEFAULT NULL,
`status` varchar(15) DEFAULT 'AVAILABLE',
`weight` double DEFAULT NULL,
`unit_id` varchar(50) DEFAULT NULL,
`added_on` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`product_id`),
UNIQUE KEY `sku` (`sku`),
KEY `unit_id` (`unit_id`),
CONSTRAINT `product_ibfk_1` FOREIGN KEY (`unit_id`) REFERENCES `units` (`unit_id`) ON DELETE SET NULL ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8