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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9c9a9797eb27fa3697ef53cf39e4d9f3b6fbd9702e241a03cfbd8e3106298a' 
  AND token = 'C96Bmu/CF1qZzCS/yHpd7hJQ6B1WKKuZkRueYaeAdWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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