Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6481845e81d0ce4e950d0b035e215874035e09b39056fe9a39df1465440d50' 
  AND token = 'eMLWy0GSUqsFrMmkPNlBrHxOnKy3/Ylk/7BpVeoGE8E=' 
  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"
    }
  }
}