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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9935aeb6a88acd15f057011b4a7902ceb910356d3f9692a1b6cfb47962f429' 
  AND token = 'OxfNfh0dHIyDH1SDSl3hgwLcX+MwC1QwpLeWNf4xVBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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