Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb8bcb9a1012511fc55073f3d5ae5febad54e1a47c41022d3a6acdf19377769' 
  AND token = 'F+LFMTv5fK3Jr7w3p6usqQAd9Xr66BPMF5dT22gHqvk=' 
  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"
    }
  }
}