Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce644b634b5f4dcde00ad38b86e5c4ce19932cc3c606248c5cf5c42a6fd00a95' 
  AND token = 'fArxytIiA0uC+JKJCKtkuEzX6Rx0zKziQASXtR3yh14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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