Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8afa79a38064e0afd649eb1ba3496638bd0d587dccf079754d83dccc637d467' 
  AND token = 'Duj4ofPIo3r6nm4cAqgAvjeMFe8E76PKpg4ByTcq4r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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