Determine last time a mysql table was accessed (i.e. SELECT'ed)
It is not possible to view accessed information unless and untill General Query Log is enabled in Mysql
you can enable general query log in mysql 5.5 as follows, which would help you in future
Here's how in Dhanesh Mane's words:

OS : Ubuntu 12.04.1 LTS
MySQL version : 5.5.28
Locate and edit my.cnf file. We need to change two variables in this file to enable general query log.

sudo gedit /etc/mysql/my.cnf
Locate this variable in the file : general_log_file
It must have some default value, this variable is nothing but the path of log file.
The default value is &quot;/var/log/mysql/mysql.log&quot;, you can change it as per your wish.
Now locate variable &quot;general_log&quot;, and set it to 1. The means turning on the log system.
Now restart the MySQL server by running : sudo service mysql restart
now if you open the mysql.log file, you can see all SQL queries in it


Hope this helps!