SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1485b27b692235877747ff07551dd5630cc8ba33efa889e6a8ba6ba6e150534' 
  AND token = 'VK5BX+bJnCQN0GylC3gTXiJ2IWt+0P8OlzNG//W0F40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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