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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73789302c70c891ec06732761c70de7f63bd462e19091af23bb3bb17b2d9db2a' 
  AND token = 'RNveMrlMjHtX6ztG031/CEBhUUm4CA1B64YTaJ1qwec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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