Presto comes from Italian for “quickly.” Officially, presto is the second-quickest speed that music can be played (after prestissimo).  Presto comes from late Latin praestus ‘ready’, from Latin praesto ‘at hand’. 

The earliest known use of the word presto is in the late 1500s. OED's earliest evidence for presto is from 1598, in the writing of George Chapman, poet and playwright.  

Examples of presto used in a sentence: 
"The hungry men dived into the food, and presto, it was gone."  
"Just pop a K-Cup in, add some water, press the button, and presto, coffee!"  
"You fold the rear seat flat, press a button, and hey presto!" 
"You put your money in the machine, and presto, the coffee comes out." 

Just the facts:

PRESTO Definition & Meaning - Merriam-Webster

2 hours ago, Bill W said:

Presto comes from Italian for “quickly.” Officially, presto is the second-quickest speed that music can be played (after prestissimo).  Presto comes from late Latin praestus ‘ready’, from Latin praesto ‘at hand’.

Ready and at hand and quickly. Why am I thinking what I'm thinking?