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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb9afdaa5aa43593ebbd7f1b7d999f8ef920f51c7d6da0ce556bd4204196f22' 
  AND token = 'Dx4QjgLw2jgbP9U9drMctOCNctVhygS92RSlr2XMOxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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