Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca48684645281590a166742de76f79363132103bfb738008939aa61de43ebd60' 
  AND token = 'xZ8vyfuWksZzdPqk+s5q+u6n5tJS7nFFdemJeqzXZT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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