Drush command to run cron won't work in Crontab
I ran into a similar issue multiple times. I think in all cases cron was running a different version of php.  To fix I ended up having to define my php path in my drush call:

*/5 * * * * /usr/local/bin/php /home/myuser/bin/drush elysia-cron run --root=/home/mysite/public_html --uri=www.mysite.com


Also, another thing that helped me debug the issue is by adding a log path &gt; path/to/file.log like this and then looking at the exact error: 

*/5 * * * * /usr/local/bin/php /home/myuser/bin/drush elysia-cron run --root=/home/mysite/public_html --uri=www.mysite.com &gt; /home/mysite/cron.log 2&gt;&amp;1