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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972f171dc0e1cda025b1fd67fc89b7fd0f3bb8d6114f5cc3d58bd4bcc8df0057' 
  AND token = 'NfVX7gbhXM92xPtT+9SpM/4+JbxYf0QmPjgQ9Diqvyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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