SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81989bfef036a76f09c9284064b1c7ca6440c820e7f530512764d23e38b342d1' 
  AND token = 'VFZhw5iq8Sg3QnGDmZAnHofU9E/mGIw3LV5PUtibDRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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