SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e3d80722d6df7e7b578240918c61c664d27e343355ecd857f376f3792f3b3e' 
  AND token = 'aXs0GOshVwvUzrYVfYKekcRD5zosUB0jrJzNa/O4OOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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