Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514f1586db9dda998b01898ea9908ea4429aad1dbf6cd17c9d515ba17c4601ff' 
  AND token = 'VJ/OxJSBGyX3XzRSpRwWbJSxKHvUKdMwtu/4T03/KIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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