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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d35cfc08743f9123802d77b0c7b18eef1f8fc895394c6c0caf64365756d3db9' 
  AND token = 'afw8WpJ9k/czqtb9mKDAILBdZ2ZvKt683a/gPSf88KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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