Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb30f1c67313bcb4dae431de870d7358e492044d891b20fe0ce4b9d3077f01e7' 
  AND token = 'amri/ftzOXdpCxM+4pXmhxWQPT50RT2pQxVSyvwNZjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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