Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49a697c769d008b8fb42309c648000c85d8368665d6e62995ee0504d7d28504' 
  AND token = 'FCvzKQvEIEIjdNd+ecPitcxqHsujAwHbGEwYhzWv/oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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