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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81c354c63ac3905d71539f902e591a43ea98d33792140e5f2040b8fd6dc0aba' 
  AND token = '8VSPtjJiUM1YFM6SSoLMM0fx4/iuTz/6c3hIYa1JPUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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