Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c171269f9a0d9fe45e3e41444d806bb6a94bb6288d5352fd5a33b473aee07ec' 
  AND token = 'nu3he4spTpKJaQfCHtx0P/Tp3nRmFCV92O3HiZykjAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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