Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c510c862e3fbddb70ba00ef7d150435d5116952d8f410c2716213aa7ccaf8c' 
  AND token = 'lAqTnpgcfDx5I8FZheYNrhHpBdsykQKCQnTI/+ETz1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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