Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32380a15a4172b920d68a0d9e85c8193bcf500d16199268f1524f2a6a8aa182d' 
  AND token = 'xzz8HXWDxHcCmFODnq7VpjREzFOaJbtDXjfQ+3ZU+k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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