Let’s review a few things before you go to your MySQL. The first big issues would be the size of the images, how big are they?
If you have images with a size of 4,5,6,7 MB it will take time until they load. Imagine having 6 images which are 5 MB of size. Every time a new person opens your website, he’ll have to download 30MB of Images to open the website. Here you have a couple of ways to deal with this. Optimize images before uploading them and install a plugin to optimize them after you’ve uploaded them. There are multiple Image optimizers that can help you out in such a case.
Next, you need to Cache your website. Caching is a way of saving the homepage in order for the server to serve it more quickly. Again, since you are using WordPress, there are available plugins for this. I’ll recommend using W3-Total-Cache as it provides a couple of caching methods you can use.
Try to optimize your website, usually, the database is not the source of the problems but something else along the way is.