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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c773ad8029c00c86b6cd07315c960bf085695c157401965bbc95447a55ec6880' 
  AND token = '5RgCR2h0YBpQtw7iHvWPDkGN+pwPLH5fL1l+XtzsIp8=' 
  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"
    }
  }
}