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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b654c966dcb7a6f56a9e9a4cd966a1690c077b06c173c38fe21959d45a62be5f' 
  AND token = 'X+cjXBX5JVIO+VkTYYqA7vX+pnFNcx5zP6/A6sbWMI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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