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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ccbfefbe661b9c659b29398274ccea2a098d767ba1fd735076adde3196124a' 
  AND token = '69hljC/kbgYNL3WPXfgy/wB7idm5CDucSQ3FlYZ/fWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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