Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1090fbbb490a6488a7a195a88c56b04c20b06424d7121027b0784376720efa7a' 
  AND token = 'gfd8UWrIIaH2ek8FPhFQjD3gUmvm5S5EtkgVyA7bMTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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