Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff93383b8f3ec29cc2b8404400ca9c12652d98ed3b54b6d9c43ff26be6b4c32d' 
  AND token = 'OO7D86AddpeqXbkG5z0iUpQkKJIWMAKnIdZyYHnhHM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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