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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ea47196a58465dd998bcc6771be5944e44ed0f2d7fec2b6a3d47c26896b92b' 
  AND token = 'oPhRd929H/iRqJx4u2BVTiksht4/RXE/crTItm1azzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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