Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ecfd0f8f87300b357a5361ea051dd9df3269ab47eaa769a8f8c11ec3899ec1' 
  AND token = 'ia1prnQJ1QPCrCfONi6p2UovqKIJrLzI5gOTN0WurlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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