Are you connecting to them via the private network?

Nope my API´s are in AWS servers, I just move my databases from planet scale to railway

What region are your services on AWS in?

In us-east-1

Your databases on Railway are in US-West1, I would highly recommend running your services on Railway and connecting to the database via the private network.

In this moment we can not move our ec2 instances to railway, we just wan to know if railway is a good provider for databases, is there another way make more fast the responses from railway databses to our ec2 instances?

If we upgrade the plan the responses will be the same?

The best you could do if you stay on AWS would be to move them to the same region as the databases you have deployed to Railway.

The Hobby plan does not have faster networking, cpu, or memory, just more of it.

The slowness you are seeing is because you are connecting publically to databases across the country, databases are extremely sensitive to such things.