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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43313d99c4eabc1d4f1209bd8d320a792a7ff79420823eace65508697e7d0da0' 
  AND token = 'ycFgu4HIZ9PF0W8TOGCt55XQAbVzb+FM5LYumApel9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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