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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cc4f7863ab68802a4fc6a28d7d6988e480308caaaff7b4bebef37c5d91e4ca' 
  AND token = 'dA9Tx3JKzujpHI4QMgwpoaKvllEa3ZwK3fdEUr8uPyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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