Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b581190ada6f4f4086f654a020707de1785d2eebefc45c73f713a2a9d9ed8f' 
  AND token = 'EK64IkVZSxxmu4Ulg1ONS/Eo8jVBEE9aF5Ev0AAsmco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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