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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b068794f893861770288969c69796933c5610a9913826aaf2ef29019c5e6da87' 
  AND token = '5TrnCpSen8V3YFoq8BSOJYmsAIdV/2BHyQrOTog+97M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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