Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001a2dafb460b97e33015bec010b921de75ac655bbd6e26e6ccbebe29d58dc7f' 
  AND token = 'loxc0U+jX9+Ckzo+yUPSdW9rTyAvd6iHSAiaNEcsUK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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