Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3dbc93cf172d6e8c99ac47a0528222470bdba7a99d7de5cca8706462446bfd' 
  AND token = 'XVx01DLaV5y4bxfDCKY8tvOiQDMkn646pal79sGeljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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