Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f8a8e0eb68f44edcd4218a1a41beffa2ad854d408d76897d99416395f3af39' 
  AND token = 'Usu5X4s5VbqL8KwNRgclCcNureuwwt9hkt9rb/X1+SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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