Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64626ebb7cd76bb493508dffd8553890b616ca3954dfa0a5f72ca635d7b0ad2' 
  AND token = 'yKO2jK/PUawnpB1JsLbWOary76Epgxr8fNQOvDiMppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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