Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd07ecd9ebf4f8f151b3881a51455eaabae02c9e9e8b6b5313340592316c971' 
  AND token = '5aAVxQRlH8wZmdGp+aB7Dz4WxTf+oVpK1dVzV43DRXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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