Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7516ca59cd227aa676a3b78f0b87aa778169aec8d7210eb8529c65cb1d624fb0' 
  AND token = 'JojlNf3DJtbmW4XUqj5Sd8K2Y8Ozw7rJjyxjjr/8dq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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