Not as the key on the Jira issue.
The CSV import is sequential, so if your external system has (say) ABC-123, ABC-125 and ABC-126, you could import 4 lines of CSV - plug the hole at ABC-124 with a dummy issue and delete it later. But bear in mind your project key will need to conform to Jira standards.
Most people doing imports have a text field for catching the original issue trackers unique id as well though.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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