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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0000bd32f4952aa8feaadfdb4d681c98853b29a30ffdec2645505a602759739' 
  AND token = 'xIoJiZPBBh8hDtQS/zcPOXz30ZIfXLZ9Yg2rY9oDuRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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