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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a43c6b7f132fc44e3d07c02130325b6df61cde3ed6e39e326b4970752f7b176' 
  AND token = 'PQ1aGbk5GAtGu46rQMhMOukuGcrO46zskq+007CdLlU=' 
  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"
    }
  }
}