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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac16c275e7a0cc1290f2e34bd423706c429cab10fcfb8f9a11cf0b066268967' 
  AND token = '92SYXZMMVmWN+xJcIZgMkzqzpYAomwETbC9Wew0HI/Y=' 
  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"
    }
  }
}