The ice will melt. When very little ice is left, you may add more ice with more salt. After 20-30 minutes open the can and enjoy your ice cream. When the salt dissolves, its particles interfere with the freezing process which forms ice. Even though the temperature is 0 o C, the ice can melt.
Energy is needed to melt the ice.
This energy comes from the water. As a result the ice and the water solution becomes colder, because the heat goes to the ice. The addition of salt to ice lowers the freezing point of water. AIMS Education Foundation, 1987. Gardner, Robert, Kitchen Chemistry , 1980.