Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6136393cb4ae25b843488a457b9ed9b0b47e132b904d3715b012af3770cff26' 
  AND token = 'B4N/xMgd1bI1Z3XOdCiIQHKiGOidRwWRzvRL626iiS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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