Can I restore a table in RedShift and is it safe?

Yes, it is possible as mentioned in https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-snapshots.html#working-with-snapshot-restore-table-from-snapshot

Please note that it is possible that when you restore a very large table, the RedShift cluster can consume most of the CPU on the restore operation and become unresponsive for other operations (like normal queries for other tables). There is need for a feature that allows cancelling this operation by the user. It would help to resolve the issue self-service without AWS support attention. This feedback has been relayed to the service team as well as improving the public documentation around this topic.