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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482f02c9a1444d7bd52d151b3a35c716358265824d3b22cf76b812fb1cf61150' 
  AND token = 'ZGPOgtIXIsvEWg64dYwUwPVZ2nXg0ZYdWx0jKgWIoWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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