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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb953d1ebb93db0c91f9494acc0c389149eccf5052163e0f5262677de55c3399' 
  AND token = 'dO2WHko15gS5tjEARPffIY8gZbRDetS5HL1lsSG0OXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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