Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5365fd7d47187c80187a352b1928e5705067022557f0786e30562fce8338a2' 
  AND token = 'qz0FynhZJXQUS44Noo0uuFkPrTZwuNM4yEbiALjXD6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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