Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c00afb33f9524215484c73cf4414fd974395c9d411454b727d0497c059b373' 
  AND token = 'Y1/qs0Y/TURQqJPMBPEoqOwCsbHjXHcQMrvYhJTpUQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}