Laravel - Check if value is equal to any record in collection

I have a collection of records.

  $pastSessions = Sessions::where('id', $id)->pluck('event_start_time');

This has 12 records.

I'm trying to check if a variable is equal to any of these records, but it's only checking the last one.

if($application->appointment == $pastSessions)

How do I check is it equal to any of the records.

This is all in my controller

via Chebli Mohamed