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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b197f2373932b3cd979db8db94a7f08a4fe7d96b824d1121ed1909f6bc66a6f' 
  AND token = 'hIsy4voO4I6cG+Wc3wg0q9UMSWBkSl7+SsydBOVW5V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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