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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcaa31cbe3b643341e348a7cafd8942ff9953f18e69de48eeeced0a622fc6500' 
  AND token = 'bYf0TK04w34kgqrwyoQYeHDB4kxVnnhgjG6/g5MDPjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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