Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_10408617_5 ( prefixes VARCHAR, scheme VARCHAR, approx_premium VARCHAR )

### Question ###
What prefixes are priced at pence per minute, fixed at all times with a premium of 3p/min?

### Accurate SQL ###

SELECT prefixes FROM table_10408617_5 WHERE scheme = "Pence per minute, fixed at all times" AND approx_premium = "3p/min"