Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dc89245561b4d3bf0a17c0641067ab15ac535449b9c4355f7b943eff7f3d02' 
  AND token = '2rP3OUWs8q8v9FuBJc04Te9beSEcmCJJ8dhTzHZWLK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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