Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a86c050706ca466ebf6f8fe587ea2edb634ba550374936ce18be0b20d9bf169' 
  AND token = 'JDfpbXIEkmlU0FLxCTS9jScG9IsJzOfOjmIkvFqt4C0=' 
  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"
    }
  }
}